I have an Eiroga E71 mobile phone. I am unable to make outgoing calls from my mobile. Its showing "Check operator service". I have contacted my service provider. There isn't any problem from their end. I am able to receive incoming calls and send messages. Also, when I am putting my sim card in any other mobile, I am able to make outgoing calls. Please tell me what is the problem and what should I do. I there is any repair required, where should I get it done.